BioViva CEO Liz Parrish, photographed in Bainbridge Island, Washington. Parrish traveled to Colombia to receive experimental stem cell transplants designed to reverse signs of aging — it’ was a controversial operation rebuked by some as unethical human experimentation. A colleague gave her only days to live several months ago, she said. Parrish said she believes that the issue of aging is too important for science to ignore. Photo by Daniel Berman for OZY